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2nd cat doesn't impact exhaust that much as one in header (which you removed by getting catless header), which was the main performance killer. I wouldn't expect much from changing frontpipe's cat to high flow one and i wouldn't want to eliminate altogether unless it's race only car not used daily thus not having to deal with MOT inspections and alike. You may get some on top of catless header gains, but it will be minimal. What you'll get certainly in fully catless exhaust - it will be much louder.
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